Chemistry: Quiz: Strong and Weak Acids

Quiz: Strong and Weak Acids

1. A solution that has a high ionic concentration and allows an electrical current to pass through is called a

a. nonelectrolyte

b. weak electrolyte

c. strong electrolyte

2. A strong electrolyte is a substance that __________ dissociates in water.

a. slightly

b. completely

c. never

3. Which of the following is a weak electrolyte?

a. HBr

b. HNO₃

c. H₂CO₃

4. The larger the K_a value, the

a. smaller the degree of dissociation

b. larger the degree of dissociation

c. degree of dissociation stays the same

5. If 4.5 moles of HCl are dissolved in 1.0 liter of water, what is the concentration of the H⁺ ion?

a. 0.222 M

b. 4.5 M

c. 2.25 M

6. Hydrocyanic acid (HCN) is a weak acid. If you have a 2.00 M solution of HCN, what is the hydrogen ion concentration? The K_a = 6.2 × 10^–10.

a. 3.52 × 10^–5 M

b. 2.00 M

c. 1.24 × 10^–9 M